#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>


int main(int argc,char **argv){
        
        int fd;
        int val=1;

        fd = open("/dev/myled",O_RDWR);
        
        if(fd<0){
                printf("can't open myled_dev!\n");
        }
        
        if(argc!=2){
                printf("Usage:\n");
                printf("%s <on|off>\n",argv[0]);
                return 0;
        }
        
        if(strcmp(argv[1],"on")==0){
        
                val = 1;
        }else{
                val = 0;
        
        }

        write(fd,&val,4);


        

        return 0;
}
